Spraying device



Jan. 25, 1938.

J. H. BRENNAN sPaAYING DEVICE Filed Aug- 18' 1957 faz/@722570 l Patented Jan. 25, 1938 UNIT-Eo STA-'rss PATENT oF-Fl-CE SPRAYING DEVICE -John H. Brennan, Minneapolis,v Minn.

Application August 1'8, 1937, Serial No. 159,636

5 Claims.

'This invention relates to a spraying device, more particularly anew Vand improved type of permanently installedspraying device adapted to beconnected to "high pressure steam lines or other fluidlpressurelines available in industrialplants.

creameries, dairies and other industrial` plants it'fis often necessary, and usually desirable, to "provide ameans for spraying insecticidal and germicidal lsolutions for sanitation purposes =Such plants usually have-high pressure steam lines available and these Alines may bertapped withfauxiliary lines which in turn'may be utilized Y,

as'a source of pressure tol atomize or spray germiliquidhorizontally or'downwardly so that itnever reaches the ceilingV portions.

Certain-of these devices-also operate on the principlethat Filuid'pressure is brought to "bear on the opening or openings of theliquid delivery tubes substantiallyfatright anglestothe latter.

If feither the 'fliiidpressuretube or the liquid deliverytube become 'slightly out of linedue to vibration or'oth'er reasons-the spray will either cease or'be rendered inefcient.

'One'f the objects of this invention is to pro? vi'dea sprayerof'theuid pressure type in which liquids such as insecticidesand germicides can be"force`dmall-directions. YAffurther object is the-provisiono`f a Vsprayerirnvvhich a solution is forced inthe directionofithe ceilingfinstead of the si'de 'Walls Another-object is to providea spraying dev-ice havingfa sprayerhead with 'a plurality of nozzles enclosed and permanently adjusted to eliminate the possibility of any change of adjustment by "expansion or contraction when used '-on a steam' pressure l line.` An additional object of theinventionis' to provide a spraying devicefwith' aI` sprayer-fheadfassembly which simpliesaccessibility. to all-parts ofthe device in order to remove 'any formations Whichv might accumulatei'as a result" of scale Ior Slime passingvinto it from .the source of pressure. Stillfafurther object is to'provide a simplied method 'of fastening the liquid container to the sprayer headina manner such that it is easily'removable Without breakage. 'Another object is'fto provide'a spraying. Idevicewhich is substantially 'drip-#proof Other .objectslwill appearlhereinafter.

These objects@ are `accomplished` infaccordance with this invention' bytheprovisionlof =a spraying device comprising'a steam or airpressure cham-1A ber Which-is connected through a suitable conduit controlled by a valve to a source of steam or air Y.

The top'of the chamberis provided with means whereby it isremovable so that the chamber may be cleaned and any formations removed Which might accumulate as a result of scale or lime, usually formed orpresentin high pressuresteam lines or source of duid pressure. Removal of the top of the chamber is preferably effected by means of athreaded pressure type dome cap which lscrews into'threads disposed on theinside of the Walls of the pressure chamber.v`

The pressure chamber is likewise provided with one or more vents, preferably four, releasing pressure from the chamber to the surrounding atmosphere. `In oneportion of the pressure chamber,l preferably inf a central portion of the `base,` isw disposedv apreheating chamber. Ithas been found that'the efficiency 'of some liquids is increased;

for examplefsome insecticides, if they are heated and vaporized, notv priorto'the time of spraying."

but at substantially the same timethey comeinto contact with the pressure that atomizes` the spray. The preheating chamber, disposed in the pressure chamber, serves this purpose. l l

From the preheating chamberv a conduit or conduits lead to the aforementioned vents inthe wallsof the pressure chamber. These conduits correspondin number to the number of vents,`

preferably being four in number, and are smaller in diameter than the vents so that the steampr otheruid used as a source of pressure mayrescape. The exit portions of these delivery iconduits are preferably substantially'ush with the outer Walls of the sprayer head, or slightly With in the head. Likewise it is desirable to make them Vslightly concave in cross section at the tip. This arrangement renders the sprayer completely drip-proof; since the escaping steam or air pressure'must pass completely around the ends of the delivery'tube, and as a vacuum is created which draws the liquid from the container the liquid isoompletely enveloped and at'omlzed beioreit has a chance to drip. f

The preheatingchamberto which the delivery conduits are connected is supplied lWith liquid from the container, preferably by a singlesupply conduit which is removable by means of screw threads or other means. The single supply conduit extends to a point `nearthe bottom of the container YWhich holdsthe liquid to-be atomized or sprayed. :One of the features ofvthis invention is the provision of a cage for holding the contain` er in place Without theinecessityof..screwing the container into the base of the sprayer head. In fact it has been found desirable to avoid screw threads in the Mason jar or other type of container because in the present invention the jar is much more easily removed when it is not screwed into the sprayer head. Furthermore, possibilities of breakage caused by screwing the jar in too tightly are avoided.

Other advantages and features of the invention will become apparent from a reading of the following specication in the light of the accompanying drawing in which:

Fig. 1 represents a side elevational view of the sprayer device;

Fig. 2 represents a sectional view through line A-A of Fig. 1.

As illustrated in Fig. 1, the sprayer device consists generally of a sprayer head 2 and av container 4 for the liquid to be sprayed or atomized. A source of steam or other fluid pressure is provided by conduit 6 controlled by valve 8. The container 4 is held in place by a metal carrier I0 provided with a bottom portion or clamp I2 held tightly against the bottom of container 4 by means of springs I4. Springs I4 exert enough pressure on clamp I2 to hold container 4 in place, but may be readily extended by a hand pull of clamp I2 to permit removal of container 4.

Referring to Fig. 2, the fiuid pressure chamber is illustrated by numeral I6. This chamber, as previously described, has a removable dome or cap I8 which is provided with screw threads at point 20, corresponding threads being placed in the walls of the pressure chamber I6 at the same point.

At the base of pressure chamber I6 is disposed the outer portion of the preheating chamber 22. Connected to the inside of said preheating chamber 22 and emerging therefrom are a plurality of conduits 24 which serve to deliver the liquid to the surrounding room. 'I'hese conduits are disposed within vents 26 in the side walls of the preheating chamber I6, leaving an annular space through which steam or other fluid may escape to the atmosphere and envelop the exit portions of conduits 24.

Liquid is supplied to the preheating chamber 22 through main supply line 281 disposed in container 4. Main supply line 28 is preferably removable by means of a screw thread arrangement 30 or other suitable means in order to clean preheating chamber 22.

Carrier arrangement I0 may be readily attached to sprayer head 2 by means of bolts 32 (Fig. 1) or other suitable means. Shoulders or thread 34 of container 4 are held firmly against the flanges of sprayer head 2. The junction between the flanges of the sprayer head and the container is not airtight, however, because if such were the case, a vacuum would be created in the container. The single thread 36 helps to space the top of the container from the lower portion of the spray-` er head and permit the entry of air and at the same time facilitates the prevention of too much sidewise motion of the container. Metal band 38 encircles container 4 and is fastened by soldering or other suitable means to vertical metal stays of carrier I0. Thread 36 and band 38 both help to guide container 4 into place.

The device is simply operated by attaching the valve 8 to a source of high pressure steam or other pressure iluid. When valve 8 is opened, steam or other fluid enters through conduit 6 to pressure chamber I6. As it does so it impinges on the top of chamber 22and if a hot fluid is used, it

heats chamber 22 and the contents thereof. As soon as pressure chamber I6 is full, which is practically instantaneously, the steam or other fluid escapes through the annular spaces in the sidewalls of the pressure chamber formed by vents 26 and delivery conduits 24. As the steam or other iiuid escapes, a suction or vacuum is formed in the vortex around the exit of each of the delivery tubes. This causes the liquid in container 4 to be drawn up through main supply line 28 to chamber 22 from whence it is drawn, and finally atomized into the air from delivery conduits 24. As illustrated in Fig. 2, delivery conduits 24 are arranged at an angle of about 30 degrees and hence, liquid particles and vapor are projected upward toward the ceiling of the surrounding room. Maximum efficiency in atomization or spraying of the liquid is thus obtained, and the combination of features described makes dripping practically impossible.

It will be apparent that variations may be made in the apparatus described without departing from the invention. Usually the vertical and lateral bands of carrier I0 are constructed vof metal of substantial rigidity, but other types of materials capable of supporting container 4 may be used. Supply conduit 28 is normally largerthan delivery conduits 24 but considerable variation may be made in the sizes of the various conduits. It is usually preferable to have a plu rality of equally spaced delivery conduits to in-v sure uniform distribution. but it is not abso.y lutely essential that the conduits be equallyl spaced. While it is preferable to use four delivery conduits, the number may be varied, as,v for instance, two, three, four, five orsix delivery con;

duits.

One of the features of the invention resides inV the fact that the main feed tube 28 is removable.v

for cleaning without disturbing the adjustment of the nozzles. the nozzle of a sprayer is part of the nozzle and if removed, must be replaced with care or otherwise the nozzle will be out of adjustment. One of the further features of the present invention not heretofore discussed isthe arrangement ofthe various elements of the sprayer to prevent con-. densed moisture from running into the insecticide In most cases,.

or other liquid in the container. as little as 0.5% water will spoil an insecticide. In sprayers of the steam pressure type heretofore most commonly used,` after the steam pressure isr shut off, thecondensate that forms in the unit.'

tends to run through the steam tube, lthen drip into the feed tube and into the insecticide ljar. Any insecticide that is left is completely and al-` most instantly deteriorated. This cannot happen with the nozzle arrangement of the present in vention.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent of the United States is:

l. In a fluid pressure spraying apparatus, av

Ordinarily, the main feed tube forl circumferential openings therein whereby a fluid passing through said openings will form a vortex at the exits of said ducts, and means comprising a single supply duct for supplying said delivery ducts with a material to be sprayed.

3. In a fluid pressure spraying apparatus, the combination of a sprayer head containing a chamber having an inlet conduit connected to a source of fluid pressure and vents to the atmosphere, a second chamber in heat exchange relationship with the aforementioned chamber, ducts from the inside of said second chamber running through the first chamber to said vents and forming circumferential openings between the exterior of each duct and the sides of each vent, and means for introducing intosaid preheating chamber a liquid to be sprayed.

4. In a spraying apparatus, the combination of a sprayer head, a removable container for a liquid to be sprayed, a pressure chamber in said sprayer head connected to a source of fluid pressure, a removable dome cap on said pressure chamber, a relatively small preheating chamber in heat exchange relationship with said pressure chamber, four equally spaced vents to the surrounding atmosphere in the Walls of said pressure chamber, four delivery conduits extending upwardly from said preheating chamber through said pressure chamber to said vents, said delivery conduits each forming an annular space with the sides of a Vent, and a removable single supply line extending from said preheating chamber to a point near the bottom of the liquid container.

5. In a spraying apparatus, a chamber provided With a fluid inlet and outlet Vents to the surrounding atmosphere, a plurality of ducts passing through said chamber and forming circumferential openings in said Vents, a container for liquid to be sprayed, means for supplying a liquid from said container to said ducts, said means being removably associated with said ducts.

JOHN H. BRENNAN. 

